This Bachelor's Thesis deals with a evaluation of the barrier properties of nanocomposites. Mainly they are studied due to the possibility of nanocomposite application in a packaging industry. The influence of nanofiller on barrier properties is observed because of the possible substitution of commonly used packaging materials by he nanocomposite ones. Nanocomposite are supposed to have significantly better barrier characteristics for gas and steam. in contrast to the commonly used plastic package materials., Therefore they might provide a longer usage and health food safety at the lower film thickness.